stop_gained variants not shown correctly on peptide sequence

Fetch the Ensembl example, Get Cross-References | Uniprot, and navigate to the variant at column 178 (position 163 of ENSP00000288602).
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p.Arg163Gln
p.Arg163Leu
p.Arg163null
The last of these is for a codon variant (CGA -> TGA) which is a premature stop. It should be shown as a variant of type 'stop_gained' (or perhaps 'polypeptide_truncation'?) on the protein sequence.